The Flegal study uses BMI as a measure of obesity. BMI lumps together individuals who are more muscular than average (very healthy) with those who are fatter than average (unhealthy). A person the same height and weight as Tony Horton would be rated as equally fit even if he had never exercised a day in his life. When you use a flawed measuring device you get inaccurate results. Scientists at the CDC surely know that fat people who reduce their weight through appropriate diet and exercise (not illness) will improve their health. Instead of encouraging Americans to adopt healthier habits it has put its imprimatur on the perverse message that it’s OK to be fat.